2011 Fiscal Year Final Research Report
Field observations on bottom profile and vertical distributions of sediment for the modelling of sediment transpotation process
| Project/Area Number |
21560540
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Hydraulic engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
BABA Yasuyuki 京都大学, 防災研究所, 准教授 (30283675)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 自然現象観測・予測 / モデル化 / 海底地形 / 底質調査 |
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| Research Abstract |
Both quantitative and qualitative aspects of sediment distribution would be recognized to play an important role for proper management in a coastal zone.
In this research, some field observations below have been conducted in Joetsu-Ogata coast, Japan since 2009 in order to investigate sediment distribution in the cross-shore direction and the cross-section.
1. bottom profile measurement by GPS sounder, 2. sediment sampling(on the bottom surface), 3. sampling of boring cores
Main results are as follows
1. only fine sand deposits offshore of the bar
2. layered structure observes in some sample and the depth of the structure is around less than 1m
3. coarse and very coarse sand exist in the core sample close to the shore line
4. very coarse sand and clay layer in the trough. The layered structure would be the consequence of mixing process by the most recent high-wave conditions. The vertical distributions of sediment show both the qualitative information of existing sediment and the mixing history by the external forces.
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